include/linux/percpu.h

   1 #ifndef __LINUX_PERCPU_H
   2 #define __LINUX_PERCPU_H
   3
   4 #include <linux/preempt.h>
   5 #include <linux/smp.h>
   6 #include <linux/cpumask.h>
   7 #include <linux/pfn.h>
   8 #include <linux/init.h>
   9
  10 #include <asm/percpu.h>
  11
  12 /* enough to cover all DEFINE_PER_CPUs in modules */
  13 #ifdef CONFIG_MODULES
  14 #define PERCPU_MODULE_RESERVE           (8 << 10)
  15 #else
  16 #define PERCPU_MODULE_RESERVE           0
  17 #endif
  18
  19 #ifndef PERCPU_ENOUGH_ROOM
  20 #define PERCPU_ENOUGH_ROOM                                              \
  21         (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) +      \
  22          PERCPU_MODULE_RESERVE)
  23 #endif
  24
  25 /*
  26  * Must be an lvalue. Since @var must be a simple identifier,
  27  * we force a syntax error here if it isn't.
  28  */
  29 #define get_cpu_var(var) (*({                           \
  30         preempt_disable();                              \
  31         &__get_cpu_var(var); }))
  32
  33 /*
  34  * The weird & is necessary because sparse considers (void)(var) to be
  35  * a direct dereference of percpu variable (var).
  36  */
  37 #define put_cpu_var(var) do {                           \
  38         (void)&(var);                                   \
  39         preempt_enable();                               \
  40 } while (0)
  41
  42 #define get_cpu_ptr(var) ({                             \
  43         preempt_disable();                              \
  44         this_cpu_ptr(var); })
  45
  46 #define put_cpu_ptr(var) do {                           \
  47         (void)(var);                                    \
  48         preempt_enable();                               \
  49 } while (0)
  50
  51 #ifdef CONFIG_SMP
  52
  53 /* minimum unit size, also is the maximum supported allocation size */
  54 #define PCPU_MIN_UNIT_SIZE              PFN_ALIGN(64 << 10)
  55
  56 /*
  57  * Percpu allocator can serve percpu allocations before slab is
  58  * initialized which allows slab to depend on the percpu allocator.
  59  * The following two parameters decide how much resource to
  60  * preallocate for this.  Keep PERCPU_DYNAMIC_RESERVE equal to or
  61  * larger than PERCPU_DYNAMIC_EARLY_SIZE.
  62  */
  63 #define PERCPU_DYNAMIC_EARLY_SLOTS      128
  64 #define PERCPU_DYNAMIC_EARLY_SIZE       (12 << 10)
  65
  66 /*
  67  * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
  68  * back on the first chunk for dynamic percpu allocation if arch is
  69  * manually allocating and mapping it for faster access (as a part of
  70  * large page mapping for example).
  71  *
  72  * The following values give between one and two pages of free space
  73  * after typical minimal boot (2-way SMP, single disk and NIC) with
  74  * both defconfig and a distro config on x86_64 and 32.  More
  75  * intelligent way to determine this would be nice.
  76  */
  77 #if BITS_PER_LONG > 32
  78 #define PERCPU_DYNAMIC_RESERVE          (20 << 10)
  79 #else
  80 #define PERCPU_DYNAMIC_RESERVE          (12 << 10)
  81 #endif
  82
  83 extern void *pcpu_base_addr;
  84 extern const unsigned long *pcpu_unit_offsets;
  85
  86 struct pcpu_group_info {
  87         int                     nr_units;       /* aligned # of units */
  88         unsigned long           base_offset;    /* base address offset */
  89         unsigned int            *cpu_map;       /* unit->cpu map, empty
  90                                                  * entries contain NR_CPUS */
  91 };
  92
  93 struct pcpu_alloc_info {
  94         size_t                  static_size;
  95         size_t                  reserved_size;
  96         size_t                  dyn_size;
  97         size_t                  unit_size;
  98         size_t                  atom_size;
  99         size_t                  alloc_size;
 100         size_t                  __ai_size;      /* internal, don't use */
 101         int                     nr_groups;      /* 0 if grouping unnecessary */
 102         struct pcpu_group_info  groups[];
 103 };
 104
 105 enum pcpu_fc {
 106         PCPU_FC_AUTO,
 107         PCPU_FC_EMBED,
 108         PCPU_FC_PAGE,
 109
 110         PCPU_FC_NR,
 111 };
 112 extern const char *pcpu_fc_names[PCPU_FC_NR];
 113
 114 extern enum pcpu_fc pcpu_chosen_fc;
 115
 116 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
 117                                      size_t align);
 118 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
 119 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
 120 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
 121
 122 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
 123                                                              int nr_units);
 124 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
 125
 126 extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
 127                                          void *base_addr);
 128
 129 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
 130 extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
 131                                 size_t atom_size,
 132                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
 133                                 pcpu_fc_alloc_fn_t alloc_fn,
 134                                 pcpu_fc_free_fn_t free_fn);
 135 #endif
 136
 137 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
 138 extern int __init pcpu_page_first_chunk(size_t reserved_size,
 139                                 pcpu_fc_alloc_fn_t alloc_fn,
 140                                 pcpu_fc_free_fn_t free_fn,
 141                                 pcpu_fc_populate_pte_fn_t populate_pte_fn);
 142 #endif
 143
 144 /*
 145  * Use this to get to a cpu's version of the per-cpu object
 146  * dynamically allocated. Non-atomic access to the current CPU's
 147  * version should probably be combined with get_cpu()/put_cpu().
 148  */
 149 #define per_cpu_ptr(ptr, cpu)   SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
 150
 151 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
 152 extern bool is_kernel_percpu_address(unsigned long addr);
 153
 154 #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
 155 extern void __init setup_per_cpu_areas(void);
 156 #endif
 157 extern void __init percpu_init_late(void);
 158
 159 #else /* CONFIG_SMP */
 160
 161 #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); })
 162
 163 /* can't distinguish from other static vars, always false */
 164 static inline bool is_kernel_percpu_address(unsigned long addr)
 165 {
 166         return false;
 167 }
 168
 169 static inline void __init setup_per_cpu_areas(void) { }
 170
 171 static inline void __init percpu_init_late(void) { }
 172
 173 static inline void *pcpu_lpage_remapped(void *kaddr)
 174 {
 175         return NULL;
 176 }
 177
 178 #endif /* CONFIG_SMP */
 179
 180 extern void __percpu *__alloc_percpu(size_t size, size_t align);
 181 extern void free_percpu(void __percpu *__pdata);
 182 extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
 183
 184 #define alloc_percpu(type)      \
 185         (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type))
 186
 187 /*
 188  * Optional methods for optimized non-lvalue per-cpu variable access.
 189  *
 190  * @var can be a percpu variable or a field of it and its size should
 191  * equal char, int or long.  percpu_read() evaluates to a lvalue and
 192  * all others to void.
 193  *
 194  * These operations are guaranteed to be atomic w.r.t. preemption.
 195  * The generic versions use plain get/put_cpu_var().  Archs are
 196  * encouraged to implement single-instruction alternatives which don't
 197  * require preemption protection.
 198  */
 199 #ifndef percpu_read
 200 # define percpu_read(var)                                               \
 201   ({                                                                    \
 202         typeof(var) *pr_ptr__ = &(var);                                 \
 203         typeof(var) pr_ret__;                                           \
 204         pr_ret__ = get_cpu_var(*pr_ptr__);                              \
 205         put_cpu_var(*pr_ptr__);                                         \
 206         pr_ret__;                                                       \
 207   })
 208 #endif
 209
 210 #define __percpu_generic_to_op(var, val, op)                            \
 211 do {                                                                    \
 212         typeof(var) *pgto_ptr__ = &(var);                               \
 213         get_cpu_var(*pgto_ptr__) op val;                                \
 214         put_cpu_var(*pgto_ptr__);                                       \
 215 } while (0)
 216
 217 #ifndef percpu_write
 218 # define percpu_write(var, val)         __percpu_generic_to_op(var, (val), =)
 219 #endif
 220
 221 #ifndef percpu_add
 222 # define percpu_add(var, val)           __percpu_generic_to_op(var, (val), +=)
 223 #endif
 224
 225 #ifndef percpu_sub
 226 # define percpu_sub(var, val)           __percpu_generic_to_op(var, (val), -=)
 227 #endif
 228
 229 #ifndef percpu_and
 230 # define percpu_and(var, val)           __percpu_generic_to_op(var, (val), &=)
 231 #endif
 232
 233 #ifndef percpu_or
 234 # define percpu_or(var, val)            __percpu_generic_to_op(var, (val), |=)
 235 #endif
 236
 237 #ifndef percpu_xor
 238 # define percpu_xor(var, val)           __percpu_generic_to_op(var, (val), ^=)
 239 #endif
 240
 241 /*
 242  * Branching function to split up a function into a set of functions that
 243  * are called for different scalar sizes of the objects handled.
 244  */
 245
 246 extern void __bad_size_call_parameter(void);
 247
 248 #define __pcpu_size_call_return(stem, variable)                         \
 249 ({      typeof(variable) pscr_ret__;                                    \
 250         __verify_pcpu_ptr(&(variable));                                 \
 251         switch(sizeof(variable)) {                                      \
 252         case 1: pscr_ret__ = stem##1(variable);break;                   \
 253         case 2: pscr_ret__ = stem##2(variable);break;                   \
 254         case 4: pscr_ret__ = stem##4(variable);break;                   \
 255         case 8: pscr_ret__ = stem##8(variable);break;                   \
 256         default:                                                        \
 257                 __bad_size_call_parameter();break;                      \
 258         }                                                               \
 259         pscr_ret__;                                                     \
 260 })
 261
 262 #define __pcpu_size_call(stem, variable, ...)                           \
 263 do {                                                                    \
 264         __verify_pcpu_ptr(&(variable));                                 \
 265         switch(sizeof(variable)) {                                      \
 266                 case 1: stem##1(variable, __VA_ARGS__);break;           \
 267                 case 2: stem##2(variable, __VA_ARGS__);break;           \
 268                 case 4: stem##4(variable, __VA_ARGS__);break;           \
 269                 case 8: stem##8(variable, __VA_ARGS__);break;           \
 270                 default:                                                \
 271                         __bad_size_call_parameter();break;              \
 272         }                                                               \
 273 } while (0)
 274
 275 /*
 276  * Optimized manipulation for memory allocated through the per cpu
 277  * allocator or for addresses of per cpu variables.
 278  *
 279  * These operation guarantee exclusivity of access for other operations
 280  * on the *same* processor. The assumption is that per cpu data is only
 281  * accessed by a single processor instance (the current one).
 282  *
 283  * The first group is used for accesses that must be done in a
 284  * preemption safe way since we know that the context is not preempt
 285  * safe. Interrupts may occur. If the interrupt modifies the variable
 286  * too then RMW actions will not be reliable.
 287  *
 288  * The arch code can provide optimized functions in two ways:
 289  *
 290  * 1. Override the function completely. F.e. define this_cpu_add().
 291  *    The arch must then ensure that the various scalar format passed
 292  *    are handled correctly.
 293  *
 294  * 2. Provide functions for certain scalar sizes. F.e. provide
 295  *    this_cpu_add_2() to provide per cpu atomic operations for 2 byte
 296  *    sized RMW actions. If arch code does not provide operations for
 297  *    a scalar size then the fallback in the generic code will be
 298  *    used.
 299  */
 300
 301 #define _this_cpu_generic_read(pcp)                                     \
 302 ({      typeof(pcp) ret__;                                              \
 303         preempt_disable();                                              \
 304         ret__ = *this_cpu_ptr(&(pcp));                                  \
 305         preempt_enable();                                               \
 306         ret__;                                                          \
 307 })
 308
 309 #ifndef this_cpu_read
 310 # ifndef this_cpu_read_1
 311 #  define this_cpu_read_1(pcp)  _this_cpu_generic_read(pcp)
 312 # endif
 313 # ifndef this_cpu_read_2
 314 #  define this_cpu_read_2(pcp)  _this_cpu_generic_read(pcp)
 315 # endif
 316 # ifndef this_cpu_read_4
 317 #  define this_cpu_read_4(pcp)  _this_cpu_generic_read(pcp)
 318 # endif
 319 # ifndef this_cpu_read_8
 320 #  define this_cpu_read_8(pcp)  _this_cpu_generic_read(pcp)
 321 # endif
 322 # define this_cpu_read(pcp)     __pcpu_size_call_return(this_cpu_read_, (pcp))
 323 #endif
 324
 325 #define _this_cpu_generic_to_op(pcp, val, op)                           \
 326 do {                                                                    \
 327         preempt_disable();                                              \
 328         *__this_cpu_ptr(&(pcp)) op val;                                 \
 329         preempt_enable();                                               \
 330 } while (0)
 331
 332 #ifndef this_cpu_write
 333 # ifndef this_cpu_write_1
 334 #  define this_cpu_write_1(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 335 # endif
 336 # ifndef this_cpu_write_2
 337 #  define this_cpu_write_2(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 338 # endif
 339 # ifndef this_cpu_write_4
 340 #  define this_cpu_write_4(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 341 # endif
 342 # ifndef this_cpu_write_8
 343 #  define this_cpu_write_8(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 344 # endif
 345 # define this_cpu_write(pcp, val)       __pcpu_size_call(this_cpu_write_, (pcp), (val))
 346 #endif
 347
 348 #ifndef this_cpu_add
 349 # ifndef this_cpu_add_1
 350 #  define this_cpu_add_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 351 # endif
 352 # ifndef this_cpu_add_2
 353 #  define this_cpu_add_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 354 # endif
 355 # ifndef this_cpu_add_4
 356 #  define this_cpu_add_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 357 # endif
 358 # ifndef this_cpu_add_8
 359 #  define this_cpu_add_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 360 # endif
 361 # define this_cpu_add(pcp, val)         __pcpu_size_call(this_cpu_add_, (pcp), (val))
 362 #endif
 363
 364 #ifndef this_cpu_sub
 365 # define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(val))
 366 #endif
 367
 368 #ifndef this_cpu_inc
 369 # define this_cpu_inc(pcp)              this_cpu_add((pcp), 1)
 370 #endif
 371
 372 #ifndef this_cpu_dec
 373 # define this_cpu_dec(pcp)              this_cpu_sub((pcp), 1)
 374 #endif
 375
 376 #ifndef this_cpu_and
 377 # ifndef this_cpu_and_1
 378 #  define this_cpu_and_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 379 # endif
 380 # ifndef this_cpu_and_2
 381 #  define this_cpu_and_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 382 # endif
 383 # ifndef this_cpu_and_4
 384 #  define this_cpu_and_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 385 # endif
 386 # ifndef this_cpu_and_8
 387 #  define this_cpu_and_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 388 # endif
 389 # define this_cpu_and(pcp, val)         __pcpu_size_call(this_cpu_and_, (pcp), (val))
 390 #endif
 391
 392 #ifndef this_cpu_or
 393 # ifndef this_cpu_or_1
 394 #  define this_cpu_or_1(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 395 # endif
 396 # ifndef this_cpu_or_2
 397 #  define this_cpu_or_2(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 398 # endif
 399 # ifndef this_cpu_or_4
 400 #  define this_cpu_or_4(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 401 # endif
 402 # ifndef this_cpu_or_8
 403 #  define this_cpu_or_8(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 404 # endif
 405 # define this_cpu_or(pcp, val)          __pcpu_size_call(this_cpu_or_, (pcp), (val))
 406 #endif
 407
 408 #ifndef this_cpu_xor
 409 # ifndef this_cpu_xor_1
 410 #  define this_cpu_xor_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 411 # endif
 412 # ifndef this_cpu_xor_2
 413 #  define this_cpu_xor_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 414 # endif
 415 # ifndef this_cpu_xor_4
 416 #  define this_cpu_xor_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 417 # endif
 418 # ifndef this_cpu_xor_8
 419 #  define this_cpu_xor_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 420 # endif
 421 # define this_cpu_xor(pcp, val)         __pcpu_size_call(this_cpu_or_, (pcp), (val))
 422 #endif
 423
 424 /*
 425  * Generic percpu operations that do not require preemption handling.
 426  * Either we do not care about races or the caller has the
 427  * responsibility of handling preemptions issues. Arch code can still
 428  * override these instructions since the arch per cpu code may be more
 429  * efficient and may actually get race freeness for free (that is the
 430  * case for x86 for example).
 431  *
 432  * If there is no other protection through preempt disable and/or
 433  * disabling interupts then one of these RMW operations can show unexpected
 434  * behavior because the execution thread was rescheduled on another processor
 435  * or an interrupt occurred and the same percpu variable was modified from
 436  * the interrupt context.
 437  */
 438 #ifndef __this_cpu_read
 439 # ifndef __this_cpu_read_1
 440 #  define __this_cpu_read_1(pcp)        (*__this_cpu_ptr(&(pcp)))
 441 # endif
 442 # ifndef __this_cpu_read_2
 443 #  define __this_cpu_read_2(pcp)        (*__this_cpu_ptr(&(pcp)))
 444 # endif
 445 # ifndef __this_cpu_read_4
 446 #  define __this_cpu_read_4(pcp)        (*__this_cpu_ptr(&(pcp)))
 447 # endif
 448 # ifndef __this_cpu_read_8
 449 #  define __this_cpu_read_8(pcp)        (*__this_cpu_ptr(&(pcp)))
 450 # endif
 451 # define __this_cpu_read(pcp)   __pcpu_size_call_return(__this_cpu_read_, (pcp))
 452 #endif
 453
 454 #define __this_cpu_generic_to_op(pcp, val, op)                          \
 455 do {                                                                    \
 456         *__this_cpu_ptr(&(pcp)) op val;                                 \
 457 } while (0)
 458
 459 #ifndef __this_cpu_write
 460 # ifndef __this_cpu_write_1
 461 #  define __this_cpu_write_1(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 462 # endif
 463 # ifndef __this_cpu_write_2
 464 #  define __this_cpu_write_2(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 465 # endif
 466 # ifndef __this_cpu_write_4
 467 #  define __this_cpu_write_4(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 468 # endif
 469 # ifndef __this_cpu_write_8
 470 #  define __this_cpu_write_8(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 471 # endif
 472 # define __this_cpu_write(pcp, val)     __pcpu_size_call(__this_cpu_write_, (pcp), (val))
 473 #endif
 474
 475 #ifndef __this_cpu_add
 476 # ifndef __this_cpu_add_1
 477 #  define __this_cpu_add_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 478 # endif
 479 # ifndef __this_cpu_add_2
 480 #  define __this_cpu_add_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 481 # endif
 482 # ifndef __this_cpu_add_4
 483 #  define __this_cpu_add_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 484 # endif
 485 # ifndef __this_cpu_add_8
 486 #  define __this_cpu_add_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 487 # endif
 488 # define __this_cpu_add(pcp, val)       __pcpu_size_call(__this_cpu_add_, (pcp), (val))
 489 #endif
 490
 491 #ifndef __this_cpu_sub
 492 # define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(val))
 493 #endif
 494
 495 #ifndef __this_cpu_inc
 496 # define __this_cpu_inc(pcp)            __this_cpu_add((pcp), 1)
 497 #endif
 498
 499 #ifndef __this_cpu_dec
 500 # define __this_cpu_dec(pcp)            __this_cpu_sub((pcp), 1)
 501 #endif
 502
 503 #ifndef __this_cpu_and
 504 # ifndef __this_cpu_and_1
 505 #  define __this_cpu_and_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 506 # endif
 507 # ifndef __this_cpu_and_2
 508 #  define __this_cpu_and_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 509 # endif
 510 # ifndef __this_cpu_and_4
 511 #  define __this_cpu_and_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 512 # endif
 513 # ifndef __this_cpu_and_8
 514 #  define __this_cpu_and_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 515 # endif
 516 # define __this_cpu_and(pcp, val)       __pcpu_size_call(__this_cpu_and_, (pcp), (val))
 517 #endif
 518
 519 #ifndef __this_cpu_or
 520 # ifndef __this_cpu_or_1
 521 #  define __this_cpu_or_1(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 522 # endif
 523 # ifndef __this_cpu_or_2
 524 #  define __this_cpu_or_2(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 525 # endif
 526 # ifndef __this_cpu_or_4
 527 #  define __this_cpu_or_4(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 528 # endif
 529 # ifndef __this_cpu_or_8
 530 #  define __this_cpu_or_8(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 531 # endif
 532 # define __this_cpu_or(pcp, val)        __pcpu_size_call(__this_cpu_or_, (pcp), (val))
 533 #endif
 534
 535 #ifndef __this_cpu_xor
 536 # ifndef __this_cpu_xor_1
 537 #  define __this_cpu_xor_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 538 # endif
 539 # ifndef __this_cpu_xor_2
 540 #  define __this_cpu_xor_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 541 # endif
 542 # ifndef __this_cpu_xor_4
 543 #  define __this_cpu_xor_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 544 # endif
 545 # ifndef __this_cpu_xor_8
 546 #  define __this_cpu_xor_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 547 # endif
 548 # define __this_cpu_xor(pcp, val)       __pcpu_size_call(__this_cpu_xor_, (pcp), (val))
 549 #endif
 550
 551 /*
 552  * IRQ safe versions of the per cpu RMW operations. Note that these operations
 553  * are *not* safe against modification of the same variable from another
 554  * processors (which one gets when using regular atomic operations)
 555  . They are guaranteed to be atomic vs. local interrupts and
 556  * preemption only.
 557  */
 558 #define irqsafe_cpu_generic_to_op(pcp, val, op)                         \
 559 do {                                                                    \
 560         unsigned long flags;                                            \
 561         local_irq_save(flags);                                          \
 562         *__this_cpu_ptr(&(pcp)) op val;                                 \
 563         local_irq_restore(flags);                                       \
 564 } while (0)
 565
 566 #ifndef irqsafe_cpu_add
 567 # ifndef irqsafe_cpu_add_1
 568 #  define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 569 # endif
 570 # ifndef irqsafe_cpu_add_2
 571 #  define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 572 # endif
 573 # ifndef irqsafe_cpu_add_4
 574 #  define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 575 # endif
 576 # ifndef irqsafe_cpu_add_8
 577 #  define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 578 # endif
 579 # define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val))
 580 #endif
 581
 582 #ifndef irqsafe_cpu_sub
 583 # define irqsafe_cpu_sub(pcp, val)      irqsafe_cpu_add((pcp), -(val))
 584 #endif
 585
 586 #ifndef irqsafe_cpu_inc
 587 # define irqsafe_cpu_inc(pcp)   irqsafe_cpu_add((pcp), 1)
 588 #endif
 589
 590 #ifndef irqsafe_cpu_dec
 591 # define irqsafe_cpu_dec(pcp)   irqsafe_cpu_sub((pcp), 1)
 592 #endif
 593
 594 #ifndef irqsafe_cpu_and
 595 # ifndef irqsafe_cpu_and_1
 596 #  define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 597 # endif
 598 # ifndef irqsafe_cpu_and_2
 599 #  define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 600 # endif
 601 # ifndef irqsafe_cpu_and_4
 602 #  define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 603 # endif
 604 # ifndef irqsafe_cpu_and_8
 605 #  define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 606 # endif
 607 # define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val))
 608 #endif
 609
 610 #ifndef irqsafe_cpu_or
 611 # ifndef irqsafe_cpu_or_1
 612 #  define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 613 # endif
 614 # ifndef irqsafe_cpu_or_2
 615 #  define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 616 # endif
 617 # ifndef irqsafe_cpu_or_4
 618 #  define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 619 # endif
 620 # ifndef irqsafe_cpu_or_8
 621 #  define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 622 # endif
 623 # define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val))
 624 #endif
 625
 626 #ifndef irqsafe_cpu_xor
 627 # ifndef irqsafe_cpu_xor_1
 628 #  define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 629 # endif
 630 # ifndef irqsafe_cpu_xor_2
 631 #  define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 632 # endif
 633 # ifndef irqsafe_cpu_xor_4
 634 #  define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 635 # endif
 636 # ifndef irqsafe_cpu_xor_8
 637 #  define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 638 # endif
 639 # define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val))
 640 #endif
 641
 642 #endif /* __LINUX_PERCPU_H */